US4420239A - Exchange mount with data transmitting electrical contacts - Google Patents

Exchange mount with data transmitting electrical contacts Download PDF

Info

Publication number
US4420239A
US4420239A US06/372,776 US37277682A US4420239A US 4420239 A US4420239 A US 4420239A US 37277682 A US37277682 A US 37277682A US 4420239 A US4420239 A US 4420239A
Authority
US
United States
Prior art keywords
mount
camera
contact
contact pin
lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/372,776
Other languages
English (en)
Inventor
Haneishi Yasuyuki
Shinsuke Komoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Assigned to ASAHI KOGAKU KOGYO KABUSHIKI KAISHA reassignment ASAHI KOGAKU KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HANEISHI, YASUYUKI, KOMOTO, SHINSUKE
Application granted granted Critical
Publication of US4420239A publication Critical patent/US4420239A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably

Definitions

  • the present invention relates to a lens exchange mount having electrical contacts for transmitting data.
  • the first automatic exposure control system is a shutter-priority system wherein an exposure time or a shutter speed is manually selected by the photographer with priority, and the size of the aperture opening is determined by the camera from the shutter speed thus selected so as to automatically provide suitable exposure.
  • the second automatic exposure control system is an aperture-priority system wherein the aperture size is selected by the photographer, and the exposure time is automatically controlled by the camera so that, again, suitable exposure is provided using the exposure time thus selected.
  • the first system will be referred to as “auto”, and the second system will be referred to as “manual”.
  • manual as used herein, is broadly defined to also include the case where the photographer manually sets both the shutter speed and the aperture size without using the automatic exposure control of the camera.
  • data from the lens In general, in carrying out an automatic exposure control and in displaying the shutter speed and the aperture size according to the automatic exposure, data from the lens, such as the maximum aperture size and the minimum aperture size of the lens, must be transmitted to the camera body when the exchangeable lens is coupled to the camera body.
  • electrial contacts are provided on the confronting surfaces of the mounts of the camera body and of the photographing lens, respectively, so that data from the lens are transmitted, as electrical signals, directly to the camera body from the lens.
  • FIG. 1 shows a prior art device having electrical contacts for transmitting the "auto” and "manual” switching data.
  • an electrical contact 1 is so designed that it does not protrude from a mount surface while, on the photographing lens, an electrical contact 2 is urged to protrude from the mount surface.
  • a switching plate 5 is rocked through a switching member 4 by the "auto” and “manual” switching operation of an aperture control ring 3 so as to cause the urged electrical contact 2 on the photographing lens to retract into and protrude out of the mount surface. Therefore, the electrical contact 2 is moved into and out of engagement with the electrical contact 1 on the camera body so that proper connection and disconnection of the necessary circuits are achieved.
  • FIG. 2 shows another device having electrical contacts for transmitting the inherent aperture size data of the lens to the camera.
  • a switching member 7, provided for fixing ring 6 on the lens is externally operated to cause an electrical contact 8, integral with the switching member 7, to retract into and protrude out of the lens mount surface so that electrical contact 8 is moved into and out of engagement with an electrical contact 9 on the camera.
  • an object of the present invention is to provide an exchange mount having an improved switching member and improved data transmitting electrical contact design.
  • only a limited number of contact pins are required to be provided on a mount surface on the lens in correspondence to the data to be transmitted, such as the inherent aperture size data of the lens, thus resulting in a compact and simplified construction.
  • no mechanism is required to make the contact pins retract into and protrude out of a lens.
  • FIGS. 1 and 2 are sectional views showing the essential components of a conventional electrical connection mechanism
  • FIG. 3 is a front view of part of a camera body
  • FIG. 4 is a perspective view of an exchange mount which is coupled to the camera body of FIG. 3;
  • FIGS. 5 and 6 are sectional side views showing the essential components of a first embodiment of the present invention.
  • FIGS. 7 and 8 are sectional side views showing the essential components of a second embodiment of the present invention.
  • FIG. 3 is a front view of part of a camera body 10.
  • An electrically conductive mount 11 is fixedly secured to the camera body 10 with screws 12.
  • a branch line, which is connected to the mount 11, extends from an exposure control circuit (not shown) provided in the camera body 10.
  • FIG. 4 is a perspective view of an exchange mount 13 which is mounted on the mount 11 of the camera body 10. Similarly, as in the case of the camera body 10, an electrically conductive mount member 14 is secured to the exchange mount 13 with screws 14a. Electrical contacts 15 and 16 are provided on the mount 11 of the camera body and the mount member 14 of the exchange mount 13, respectively, so that the electrical contacts 15 and 16 are electrically connected together. These contacts transmit, to the camera body, the inherent aperture size data from the lens barrel which is connected to one end of the exchange mount 13, as well as other important data such as electrical data governed by electrical elements such as resistors.
  • An “auto” and “manual” switching lever 17, which can be operated externally, is provided on the outer wall of the exchange mount 13.
  • the lever 17 When the lever 17 is set to “auto”, data from the lens are transmitted to the camera body, as described below.
  • the lever 17 is turned about the optical axis to achieve the switching operation; however, it may be so designed as to be operated perpendicularly to the optical axis, using a button to achieve the same switching operation.
  • the exchange mount 13 is coupled to the camera body 10 in a conventional manner through bayonet engagement means. That is, the exchange mount 13 is rotated relative to the camera body so that the exchange mount is coupled to the camera body. When this rotation comes to an end, a lock pin 18, which is urged to protrude from the mount 11 of the camera body, is engaged with a lock groove 19 formed in the mount member 14 of the exchange mount 13. When the exchange mount 13 is coupled and locked to the camera body 10, the electrical contacts 15 are electrically connected to the electrical contacts 16.
  • each electrical contact 15 is electrically insulated from the mount 11 of the camera and brought into contact with a substrate 22, which is connected to branch lines that extend from various circuits such as an exposure control circuit (not shown) in the camera. Furthermore, the electrical contact 15 is brought into contact with the respective electrical contact 16 on the mount member 14 on the exchange mount 13. The electrical contact 15 protrudes from the mount surface 11 due to the biasing force of a spring 23.
  • the electrical contact 16 is electrically insulated from the mount member 14 and a fixing ring 25, which are made of electrically conductive material, by collars 24 and 26. There is a predetermined space between the rear end of the electrical contact 16 and a transmitting contact 27, which is provided in the mount member 14.
  • the switching contact 28 of the switching lever 17 is arranged in the space between the rear end of the electrical contact 16 and the transmitting contact 27.
  • FIG. 5 shows a state of the switching contact 28 when the switching lever 17 has been set to "auto".
  • the transmitting contact 27 is urged not to protrude from a front surface of a mount member 31 of the exchange mount 13 by a spring 30.
  • the lens barrel 20 is connected to the mount member 31 by a mount 32.
  • a contact pin 33 protrudes from the mount 32 of the lens barrel 20, and pushes the transmitting contact 27 towards the camera body 10 against the elastic force of a spring 30; therefore, one end of the transmitting contact 27 presses against the switching contact 28 of the switching lever 17.
  • the switching contact 28 is brought into contact with the electrical contact 16. Therefore, the mount 11 of the camera body 10, the camera side mount member 14 of the exchange mount 13, the fixing ring 25, the transmitting contact 27, the switching contact 28, the electrical contact 16 of the exchange mount 13, and the electrical contact 15 on the camera are electrically connected. This results in the branch line of the control circuit, which is connected to the electrical contact 15 on the camera, being connected to the branch line of the same circuit connected to the camera mount 11 so that the desired data, such as the inherent aperture size data of the lens, is transmitted to the camera.
  • the camera side mount member 14 of the exchange mount 13 is made of electrically non-conductive (dielectric) material
  • connecting pins must be embedded in the camera side mount member 14 of the exchange mount 13 so that the camera mount 11 is electrically connected to the fixing ring 25 of the exchange mount 13.
  • the switching contact 28 of the switching lever 17 is brought into contact with the electrical contact 16 when the contact pin 33 of the lens barrel mount 32 is depressed as the lens barrel 20 is mounted on the camera side mount member 31.
  • the branch line of the circuit connected to the electrical contact 15 is connected to the branch line connected to the camera mount 11.
  • FIG. 6 shows a position of the lens barrel mount 32 where no contact pin 33 is provided.
  • the switching lever 17 has been set to "auto", and, in this case, the transmitting contact 27 is pushed towards the lens barrel by the elastic force of the spring 30.
  • the switching contact 28 of the switching lever 17 does not contact the electrical contact 16, and no current flows therethrough.
  • the inherent lens data such as aperture size
  • the lens data are indicated by the number of contact pins 33 or the positions thereof, and the lens data are transmitted to the camera when the contact pins 33 depress the transmitting contacts 27.
  • This effect can be obtained by merely embedding the contact pins 33 in the mount 32 of the lens barrel 20, in accordance with the inherent aperture size data of the lens barrel 20.
  • FIG. 8 shows a position of the lens mount 32 where no long contact pin 35 is provided. In this case, the switching contact 28 is not pressed and no current flows, as in the case of the above-described embodiment.
  • the contact pins for transmitting the lens data are provided only in the lens barrel mount. Therefore, it is unnecessary to provide a switching member and a mechanism for causing contact pins to retract into and protrude out of the lens; thus, the manufacturing cost and the weight of the lens barrel can be reduced. Furthermore, the exchange mount itself, being simple in construction, can be manufactured easily.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Structure And Mechanism Of Cameras (AREA)
US06/372,776 1981-05-01 1982-04-28 Exchange mount with data transmitting electrical contacts Expired - Lifetime US4420239A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56-63619[U] 1981-05-01
JP1981063619U JPS6241307Y2 (en]) 1981-05-01 1981-05-01

Publications (1)

Publication Number Publication Date
US4420239A true US4420239A (en) 1983-12-13

Family

ID=13234509

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/372,776 Expired - Lifetime US4420239A (en) 1981-05-01 1982-04-28 Exchange mount with data transmitting electrical contacts

Country Status (2)

Country Link
US (1) US4420239A (en])
JP (1) JPS6241307Y2 (en])

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639099A (en) * 1984-10-06 1987-01-27 Fuji Photo Optical Co., Ltd. Optical instrument
US4653889A (en) * 1984-05-18 1987-03-31 Asahi Kogaku Kogyo Kabushiki Kaisha Electric contact arrangement for individual objectives
US4802738A (en) * 1986-02-26 1989-02-07 Minolta Camera Kabushiki Kaisha Intermediate optical device
US4860043A (en) * 1986-02-05 1989-08-22 Asahi Kogaku Kogyo K.K. Apparatus for kinematic linkage in interchangeable lens type of camera
US4994829A (en) * 1989-07-10 1991-02-19 Nikon Corporation Waterproof camera and lens mount therefore
US5030982A (en) * 1989-07-06 1991-07-09 Asahi Kogaku Kogyo Kabushiki Kaisha Single lens reflex camera
US5227832A (en) * 1990-11-22 1993-07-13 Asahi Kogaku Kogyo Kabushiki Kaisha Camera system
US5328391A (en) * 1990-09-10 1994-07-12 Asahi Kogaku Kogyo Kabushiki Kaisha Contact pin subassembly
US5461445A (en) * 1992-12-24 1995-10-24 Asahi Kogaku Kogyo Kabushiki Kaisha Apparatus for attaching and detaching accessory of lens
US5502599A (en) * 1993-07-27 1996-03-26 Nikon Corporation Conductive connector for camera system components
US5778271A (en) * 1996-01-31 1998-07-07 Minolta Co., Ltd. Bayonet mount and photo-taking lens barrel for interchangeable lens camera system
FR2774484A1 (fr) * 1997-12-05 1999-08-06 Asahi Optical Co Ltd Boitier d'appareil de prise de vues, objectif photographique et systeme d'appareil de prise de vues
US6341902B1 (en) 1997-12-05 2002-01-29 Asahi Kogaku Kogyo Kabushiki Kaisha Photographic lens recognition system for a camera body
CN105308501A (zh) * 2013-06-21 2016-02-03 富士胶片株式会社 电接点装置、透镜单元、摄像装置
WO2022028861A1 (de) * 2020-08-04 2022-02-10 Robert Bosch Gmbh Kameramodul, verfahren zur herstellung eines kameramoduls

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104649A (en) * 1975-11-06 1978-08-01 Canon Kabushiki Kaisha Adaptor for providing a digital signal indicating the full open F number of an interchangeable photo-taking lens in a single lens reflex camera system
US4230403A (en) * 1977-02-08 1980-10-28 Canon Kabushiki Kaisha Mounting for interchangeable camera lens assembly with diaphragm means
US4357089A (en) * 1980-02-26 1982-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Electrical contact arrangement for photographic camera with interchangeable lens

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4821855U (en]) * 1971-07-24 1973-03-13
JPS609781Y2 (ja) * 1977-02-22 1985-04-05 ミノルタ株式会社 レンズ交換式カメラの電気接続装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104649A (en) * 1975-11-06 1978-08-01 Canon Kabushiki Kaisha Adaptor for providing a digital signal indicating the full open F number of an interchangeable photo-taking lens in a single lens reflex camera system
US4230403A (en) * 1977-02-08 1980-10-28 Canon Kabushiki Kaisha Mounting for interchangeable camera lens assembly with diaphragm means
US4357089A (en) * 1980-02-26 1982-11-02 Asahi Kogaku Kogyo Kabushiki Kaisha Electrical contact arrangement for photographic camera with interchangeable lens

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4653889A (en) * 1984-05-18 1987-03-31 Asahi Kogaku Kogyo Kabushiki Kaisha Electric contact arrangement for individual objectives
US4639099A (en) * 1984-10-06 1987-01-27 Fuji Photo Optical Co., Ltd. Optical instrument
US4860043A (en) * 1986-02-05 1989-08-22 Asahi Kogaku Kogyo K.K. Apparatus for kinematic linkage in interchangeable lens type of camera
US4802738A (en) * 1986-02-26 1989-02-07 Minolta Camera Kabushiki Kaisha Intermediate optical device
US5030982A (en) * 1989-07-06 1991-07-09 Asahi Kogaku Kogyo Kabushiki Kaisha Single lens reflex camera
US4994829A (en) * 1989-07-10 1991-02-19 Nikon Corporation Waterproof camera and lens mount therefore
US5328391A (en) * 1990-09-10 1994-07-12 Asahi Kogaku Kogyo Kabushiki Kaisha Contact pin subassembly
US5227832A (en) * 1990-11-22 1993-07-13 Asahi Kogaku Kogyo Kabushiki Kaisha Camera system
US5461445A (en) * 1992-12-24 1995-10-24 Asahi Kogaku Kogyo Kabushiki Kaisha Apparatus for attaching and detaching accessory of lens
US5502599A (en) * 1993-07-27 1996-03-26 Nikon Corporation Conductive connector for camera system components
US5778271A (en) * 1996-01-31 1998-07-07 Minolta Co., Ltd. Bayonet mount and photo-taking lens barrel for interchangeable lens camera system
FR2774484A1 (fr) * 1997-12-05 1999-08-06 Asahi Optical Co Ltd Boitier d'appareil de prise de vues, objectif photographique et systeme d'appareil de prise de vues
US6336754B1 (en) 1997-12-05 2002-01-08 Asahi Kogaku Kogyo Kabushiki Kaisha Setting communication system in accordance with type of lens attached to body
US6341902B1 (en) 1997-12-05 2002-01-29 Asahi Kogaku Kogyo Kabushiki Kaisha Photographic lens recognition system for a camera body
CN105308501A (zh) * 2013-06-21 2016-02-03 富士胶片株式会社 电接点装置、透镜单元、摄像装置
US20160085138A1 (en) * 2013-06-21 2016-03-24 Fujifilm Corporation Electric contact device, lens unit, and imaging device
US9709875B2 (en) * 2013-06-21 2017-07-18 Fujifilm Corporation Electric contact device, lens unit, and imaging device
CN105308501B (zh) * 2013-06-21 2018-01-16 富士胶片株式会社 电接点装置、透镜单元、摄像装置
WO2022028861A1 (de) * 2020-08-04 2022-02-10 Robert Bosch Gmbh Kameramodul, verfahren zur herstellung eines kameramoduls
US12013624B2 (en) 2020-08-04 2024-06-18 Robert Bosch Gmbh Camera module, method for producing a camera module

Also Published As

Publication number Publication date
JPS6241307Y2 (en]) 1987-10-22
JPS57178232U (en]) 1982-11-11

Similar Documents

Publication Publication Date Title
US4420239A (en) Exchange mount with data transmitting electrical contacts
US4357089A (en) Electrical contact arrangement for photographic camera with interchangeable lens
US4448509A (en) Interchangeable lens barrel with signal transfer contacts
US4440484A (en) Camera lens barrel having retractable movable contacts
KR960005186B1 (ko) 상호 교환 가능한 촬영 렌즈와, 그것과 함께 사용할 수 있는 카메라 보디를 갖는 카메라
US4766453A (en) Bayonet mount structure for interchangeable photographing lens tube
KR950008339B1 (ko) 렌즈 교환 카메라용 리어 콘버터
US4256393A (en) Electronic flash attachment for cameras, provided with plural circuits for differing camera types and a removable connector module
US4417798A (en) Data transmitting electrical contact means switching device in camera
GB2083639A (en) Automatic focus camera with interchangeable lens
JPH0411850B2 (en])
US3585324A (en) Switch and reel device for remote-control operation of photographic apparatus
JPS59152424A (ja) カメラと附属品間の電気信号を授受する電気信号授受装置
US4457608A (en) Interchangeable lens with electrical contacts for transmitting data to a camera
US3812499A (en) Electrical exposure time control device for use in a photographic camera
US4051496A (en) Remote control camera
US4491979A (en) Combination electronic apparatus
US4372663A (en) Rear aperture converter
US5328391A (en) Contact pin subassembly
USRE32049E (en) Electrical contact arrangement for photographic camera with interchangeable lens
JPS5872132A (ja) 光学付属品
JPS59162531A (ja) 撮影レンズの情報伝達用電気接点
HK1048365B (zh) 安装在附件插座内的装置以及照相机附件
US5897229A (en) Camera having lens mount
JPH0116087Y2 (en])

Legal Events

Date Code Title Description
AS Assignment

Owner name: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA, NO 36-9, MAEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:HANEISHI, YASUYUKI;KOMOTO, SHINSUKE;REEL/FRAME:004156/0460

Effective date: 19820423

Owner name: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HANEISHI, YASUYUKI;KOMOTO, SHINSUKE;REEL/FRAME:004156/0460

Effective date: 19820423

STCF Information on status: patent grant

Free format text: PATENTED CASE

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M170); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M171); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M185); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY